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HARRY Styles has been secretly dating US mega-star Taylor Swift — and vows to end his womanising ways for her.

Cougar magnet Harry has rekindled his romance with the US superstar — who is just FOUR YEARS his senior.The One Direction star, 18, met the singer’s MUM last week when he joined Taylor, 22, in LA.Pals say it is a sign the couple, who had an earlier fling, are now serious.

The stars, who have been seeing each other for a few weeks, stepped out in public for the first time at the American X Factor studio in LA.

1D star Harry sat with Taylor’s mum Andrea to watch the singer — worth £100million — rehearse for her turn on the show.A pal of country pop singer Taylor said: “It was a big deal her inviting him to the show with her mum on Thursday. It was her way of showing she is ready to trust him.”

Show chief Simon Cowell, 53, has given the pair his blessing. He said backstage at the show last Thursday: “I wasn’t at rehearsal, but heard about it when I came down. I think they are good together.”Harry and Taylor dated briefly earlier this year. But their fling ended in April when Harry was snapped kissing New Zealander Emma Ostilly.

He flew out to LA after winning Taylor over — and they decided to give it a second go.Earlier this month, he bought her a necklace with a pendant in the shape of a paper airplane to match his own favourite chain.

A source said: “Harry turned up at rehearsals to watch Taylor. She delayed it 20 minutes to wait for him. He was sitting with her mum Andrea and she seemed won over too. After Taylor finished, he picked her up over his shoulder and carried her to her trailer.“They were holding hands and flirting all day. They had matching chains on and queued up together to get their lunch from the catering truck. It was all really sweet.”Harry has become infamous for his womanising — often involving older woman cougars — since his band finished third in The X Factor in 2010.

He dated Xtra Factor host Caroline Flack, 33, before his first fling with Taylor — and bedded married DJ Lucy Horobin, also 33.He has also been linked to Aussie singer Natalie Imbruglia, 37, who he met in the summer at comic James Corden’s wedding.In August, the teen was spotted out with Burberry model Cara Delevingne, 19, in London’s West End — and there were also rumours of a link with Made In Chelsea’s Caggie Dunlop, 23.

News of Harry’s rekindled relationship with Taylor will devastate his obsessive legion of fans. They have given his previous girlfriends plenty of stick on social networking sites — with Xtra Factor host Flack getting DEATH THREATS.

Harry met Taylor, from Nashville, Tennessee, at the Nickelodeon Kids’ Choice Awards in LA in March. They were introduced by Canadian pop superstar Justin Bieber, 18.

But Taylor was hurt by Harry’s antics on tour in New Zealand and started dating Conor Kennedy, 18 — great-nephew of US President JFK.

She agreed to give Harry another chance after that romance ended last month.Taylor has also been linked with British pop star Ed Sheeran, 21, American musicians Joe Jonas, 23, and John Mayer, 35, and actors Jake Gyllenhaal, 31, and Taylor Lautner, 20.

Haters gonna hate

A pal said: “She thought Harry was hot and got Justin to introduce them. She fell for him straight away. They secretly had a bit of a thing.

“They were texting and talking a lot and met up a few times. But it ended when Harry was spotted with another girl in New Zealand.“Taylor was really embarrassed by what happened and was nervous about giving him another go. But this time they have spent more time getting to know each other.

“Taylor is very full-on in relationships and falls for people quickly. Harry is being careful because he doesn’t want to hurt her again.“But he’s made it clear he likes her a lot. They have been quietly seeing each other again for a little while now.”

When US X Factor host Mario Lopez, 39, saw Harry at rehearsals and asked what he was doing there, he slapped him on the back and pointed towards Taylor.

Mario later said he had seen them holding hands and he thought they made a “cute couple”.Harry revealed only recently he was ready for a serious girlfriend.

He said: “It’s more about the person. How they act, their body language, if they can laugh at themselves. I find ambition really attractive too — if someone’s good at something they love doing. I want someone driven.”

And his pal Will Sweeney said last month: “Harry is looking for a relationship, he’s told me that.“He’s always out mixing with celebrities and going to parties with different girls, but it’s lonely for him and not what he wants.“The girls are just there for the night. You have fun but that’s the end of it.”

One Direction are heading for No1 in the US and UK charts with their second album Take Me Home, which was released last week.